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It was launched on an Atlas V 541. The cost of the launch service plus the cost of the operations to fly the rover to Mars and run it for one Martian year on the surface was about $700M. Written Jun 12, 2015.
The agency spends nearly $4 billion more on operating the International Space Station in low Earth orbit. The idea that a manned mission to Mars would cost $1 trillion seems to be an urban legend, born a decade ago from a combination of sloppy reporting and bad arithmetic and then repeated many times.